Add some missing commands

This will load icons for the relevant sidebar buttons (in
paragraph panel, used with a drawing object).

Change-Id: I5426a873db3b8b9f5d7a17c99c35529aceaf381d
Reviewed-on: https://gerrit.libreoffice.org/7992
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>